I agree that nothing last forever , however the Patriots are not going to be middle of the road , full rebuild in 2018. They have 4-5 years minimum and are building for life after Brady. If the young members of that coaching staff have learned from Belichick, they can last much longer.
The Browns are offering the #12 pick. Not their entire draft. The Pat's will trade him , they are just driving up the price. Likely the Browns 12 this year and a second round pick , either this year or next will get it done.