Who knows but as a projection of power I cannot see anything on the horizon that will 'out trump' the carrier?
IMHO I would argue that not building the carriers/selling them, and spending the money on 13/14? well financed Typhoon squadrons, MPA, more A400s, whatever you would spend the money on, would provide much more power projection capability than 2 lumbering, unprotected turkeys with 6 un-serviceable and still developmental jets on them that have bankrupted us for the pleasure of their company.
Why do we have to get the 'best' as soon as it comes out, why can't we stick with the tried and tested and move with the curve of platforms hitting their maturity rather than their infancy? Lets be honest, no-ones going to deploy their F35s this side of 2020...maybe even 2025, the way things are going; so why do we need it on operational squadrons before then?