OK, so what will you do for heavy strike?
Your Typhoons won't do that... not even the much-ballyhooed T3... since it has had its strike capabilities reduced as a cost-saving measure.
All Typhoon will be able to do is some secondary light-strike work.
Typhoon is an excellent partly-stealthy air superiority aircraft, but it is not, nor will it be, a strike aircraft... which is exactly what the F/A-18Fs are being bought to do.