The Bills will likely never have so much draft capital again. If they don't use it this year (which certainly seems to have been the plan all along), when will they get a QB (next year is supposed to be a bad year for QB's)? While waiting on a QB, your draft pieces (the decent ones) will hit free agency and need to be replaced again. QB stands above all as the most important piece on a FB team, and the Bills have waited since Kelly for a franchise guy.
Also, you can pick up decent Lineman and Linebackers in the mid-rounds of the draft, so you can still address needs (there are also some free agents still out there-- they already signed Wood's replacement).