We tend to wish what is bad for others and good for us. I wish 190 wings would come off in a dive. 
I wish our 190A5 could use the higher ata that it was cleared for in (IIRC) 1943. I wish all my planes had more of their ordnance options too.
On a more serious note, one would think that such a system would give a large advantage to aircraft with water injection, since sorties rarely last long enough to run out, in the case of the Ta 152.
If the 109s had a similar duration, they could run wep for the entire sortie, since their internal fuel capacity only gives about 1/2 hr on mil power.
A K4 with WEP performance for the entire sortie would really be a sight to see. The jugs could probably run WEP for a typical sortie in AH as well; P-47M might become even more common for that reason alone.