Do you think that future bombers and interceptors like Mig-41, could benefit (and it's worth it) from having some qualities of so called 5-th generation fighters? Like "stealthy" airframe, internal weapon bays, supersonic cruise speed?
Well each have different roles that place value in different performance capabilities.
For an interceptor a powerful large radar array is valuable... stealth is not that useful as the interceptor will be operating over friendly airspace most of the time and will be scanning with a range of sensors to detect threats and targets.
Supercruise means accelerating to and flying at supersonic speed without using afterburner.
For an interceptor it is not really important to supercruise because interception should be at max speed so ABs will be used most of the time to get to the target as quickly as possible.
For a bomber the ability to supercruise would be rather valuable because when you are flying at supersonic speed an enemy aircraft trying to intercept you from the side or rear needs to fly at supersonic speed with AB to catch you... that greatly shortens their range and ability to shoot you down.
For a bomber stealth is also useful, but long range cruise missiles allowing standoff attacks are just as effective in that the bomber never gets close to enemy air defences so its radar signature is not important.
Internal weapons means lower drag and lower RCS which is good for bombers and interceptors.
The most important things for the interceptor is being able to find their target... that means big radars, IRST, long wave radars, and a net connection to ground and air and space based sensors. It means being able to fly long distances at very high speed. It means carrying a heavy load of air to air weapons.
The most important things for a bomber is being able to hit their target... stealth can assist in this but also long range standoff missiles can do the same job. Long flight range and reasonable speed make it better at its job too.
The Bear is looked down upon by most western media but its low operational costs and its excellent flight range are very big benefits that make it a very capable aircraft.
Its subsonic speed mean very large external loads of big missiles can be carried without reducing performance that much.
Kh-101 and Kh-102 missiles have a range of 5,000km so from 5,000km range the Bear is actually very stealthy...
Having said that a supercruising flying wing bomber that is stealthy but can supercruise at say mach 1.6 would be near impossible for most F-35s to intercept, and the performance of most fighter interceptors in the west is dramatically reduced when they have to accelerate to fly at supersonic speed...
Of course variable cycle jet engines that include a scramjet and your top speed is limited by heat strength of the structure.