Your plan, to me anyway, suggests you don't think the Bills have a chance in hell of competing this year. If you're the Browns and you don't expect to compete for several seasons your plan makes some sense. If you think you're going to field a competitive team, which the moves the FO has made in the offseason thus far would suggest that is their belief, then going in to the season without a known quantity as a backup QB is not a good plan.
Yates doesn't stop them from drafting a QB and putting either Jones or the rookie on the PS. It also doesn't stop them from moving Yates to #3 or cutting him if, hallelujah, either Jones or the rookie looks like a legitimate QB. Developing 3 unknowns in one offseason isn't likely to succeed, and is probably more likely to guarantee the failure of all 3.