If it's another disappointing 1st round exit, then I think "massive changes" would be understating things. If it were up to me, another disappointing 1st round or 2nd round exit would result in Shanny getting fired, the entire coaching staff getting fired, every roster player not named Matthews would be on the block, at least 1 of the core 4 gone for sure, and more.
I'm a very patient fan. But at this point failure would prove beyond a doubt that the plan doesn't work. So make changes while you still have Matthews under contract and try a different plan.