A successful P.1154 would reshape, not save, CVA-01

Would a successful supersonic P.1154 V/STOL aircraft make the CVA-01 carriers more likely to be built?

No; removing the need for catapult-and-arrestor operations weakens the case for CVA-01 as designed and favors a much larger Invincible-style carrier instead.

If the P.1154 delivered successful supersonic vertical or short takeoff performance, the Royal Navy would no longer need the same CATOBAR carrier. The panel therefore imagines a large V/STOL carrier closer to a super-Invincible than the historical CVA-01 configuration. The key procurement lesson is that aircraft and carrier design form one system: changing one can erase the rationale for the other.