Against Chinese fighters,yeas it is survivable and even destroy most of the Chinese platforms like su35.only grey area is j20 vs f15. Even Rafale vs J20 scenario too a grey area.
Against s400 both Rafale & F15 will have tough time, but the advantages of f15 is the option of advanced & upcoming s400 neutralizing weapons from USA.
According to the Americans, after 2030, even the F-22 is not going to be survivable against future versions of the J-20. It's actually one of the reasons why they have accelerated the development of PCA.
Emerging integrated and networked air-to-air, surface-to-air, space and cyberspace threats, as well as aging and shrinking fleets of US weapon systems, threaten the Air Force’s ability to provide air superiority at the times and places required in the highly contested operational environments of 2030 and beyond.
Threat capabilities are likely to advance along two major vectors over the next 15 years. First, traditional threat systems will continue to evolve and proliferate. Along this threat vector are advanced fighter aircraft, sensors, and weapons. While near-peers have most of these capabilities today, advanced air and surface threats are spreading to other countries around the world. Air superiority forces will face growing numbers of these threats across a wide range of locations and scenarios in 2030.
The Air Force’s projected force structure in 2030 is not capable of fighting and winning against this array of potential adversary capabilities.
Which basically means, the F-22 and F-35 are going to be inadequate beyond 2030.
Read this:
The US Air Force’s radical plan for a future fighter could field a jet in 5 years
The U.S. Air Force is seeking rapid-fire plane production as it tries to surpass the capabilities of near-peer competitors like Russia and China.
www.defensenews.com
The Americans are buying F-15s so that they can operate the jets primarily in mainland US, where there is no real threat, so there's no need to use advanced technologies there. A secondary role is to provide missile support to the F-35 until such time drones capable of providing the same are developed and fielded by 2035. If the F-22 and F-35 are incapable of handling future threats, then what makes you think the F-15 can?
The F-15EX is simply a Su-30 (not even a Su-30MKI) with an AESA radar, and we are gonna get a few hundred of those by 2030 anyway. With some minor airframe modifications and plumbing for drop tanks, the MKI will do pretty much everything the F-15 can and more. It can even carry the endless amount of missiles, which is actually useless to us, because the American operating environment is very different from ours. One of its advertised capabilities is its ability to carry a heavy weapon in the centerline that weighs as much as 3000Kg, like the Brahmos-A (lol).
It's nothing more than a Su-30MKI(--) with an AESA radar. It's quite literally a downgrade for India. It can't dog fight, hence can't do most of the missions we want it to do. It's too big and heavy to meet MMRCA logistics criteria. And the basic technologies used on it are all pretty much outdated. They have kept the jet cheap for induction because of its limited capabilities, they claim a 80-90% commonality with the obsolete F-15C, because that's how they bagged the contract for the Air National Guard, as a cheap replacement for their F-15C/Ds. Basically, if a modern fighter jet radar today doesn't come with GaN, there's no point in looking at it. And except for the American jets, all other jets in MMRCA will come with GaN radars.