In terms of the squad and the scale of the rebuilding, assuming the Wiki page is fairly accurate, there's been 51 players called up in the last 12 months.
That seems like a pretty incredible volume of players, covid obviously a contributing factor.
Age bracket wise -
11 - 30+ - Caps - 459 (avg 42)
11 - 27 to 29 - Caps - 272 (avg 25)
13 - 24 to 26 - Caps - 92 (avg 7)
10 - 21 to 23 - Caps - 35 (avg 3.5)
6 - under 21 - Caps - 33 (avg 5.5)
8 of those called up not capped at all oldest being McEneff at 26 and youngest Collins at 20.
Probably only Shane Long as an outfield player at 34 is unlikely to be involved in the next campaign. Randolph is also 34, next oldest are McClean and Coleman at 32.
There's only 4 players 25 or younger with 10 or more caps.
Duffy and Hendrick and Robbie Brady are the only players not yet 30 with more than 30 caps and they're all 29.
I think the lack of caps in the 24 to 26 group really shows the failure to do any succession planning in previous regimes.
Anyway, I've time to kill and though it might interest some. I think it speaks to the scale of the rebuilding and the lack of a shortcut out.
Source: https://en.wikipedia.org/wiki/Republ..._football_team