That may have been the case pre internet but the long knives will be out very quickly if the new coach doesn't have a perfect rollout. Only need to look at Chapel Hill and the flack Fedora took the first year or NC State with a bare cupboard this year but still plenty of criticism of Doeren on the boards.
You've got to be kidding. There are still a lot of pre-internet alums alive that know our history. If the new coach is well thought of by the fan base, they will have a pretty long honeymoon.
We've played football for 112 years, Grobe coached for 13 of those. That's 99 years of mostly crap.
As of today, the teams with the worst all time winning percentage are:
Indiana
New Mexico State
Buffalo
UNLV
Wake Forest
UTEP
Kent State
FIU
Georgia St
FIU and GA St have been in FBS less than 15 years each, so we effectively are the 3rd worst team historically.
When Grobe arrived we were either last or 2nd to last (Kent State may have pulled us out of last).
Besides the obvious size of UNC and State, there is a huge difference between teams that are at least historically above 500 and Wake that is barely over 40% for winning percentage.
A well received hire will have 2 years before any serious heat is on him, that's not saying some won't bash him for less than 4 wins a season, but they will be in the 5% of the fan base range.