Out of interest, would people want Borewick out if you didn't get out the group or would you want him to have a fair crack at the 6N before making up your mind? Or would your patience extend even beyond that point. I think you should try and give him at least 2 years but for a nation like England, after a group stage exit, might be hard to justify.
IMO, he's got no credit in the bank to fall back on, with England or as head coach anywhere else (1 season at club level isn't building much credit).
I'll allow him* the frankly bad 6N period as getting used to his job, not having his choice of coaches, no real prep, time, and selection being limited by Eddie's EPS picks.
However, he's now got the coaches he wanted, and the players he wants; and he's had them in camp for 6-8 weeks and counting, will be 15 weeks by the time the RWC starts.
The warm-ups are just that, they're pre-season matches with international teams, not club; so I'm trying not to read too much into them.
Par at the RWC, given the draw, is a losing semi-final.
If we drop out in the pool stages, then I'll be calling for his head.
If we lose the QF, having failed to perform well, I'll (probably) be calling for his head.
If we lose the QF, having performed well, and just got beaten by a better team on the day - fair enough, I'll be disgruntled, but probably give him the 6N and June window.
If we lose the SF, he'll have reached par, and earned to reach the 2-year mark to see if he can refresh the squad and start getting some improvements.
If we win the SF, he's probably earned the full 4 year period (barring future bad performances.
* very generous of me, I know