How is it not possible to answer whether TB was right to sack Hughton? Of course he was. He was right the moment he did it, and he is right now we are 99% assured of Prem safety.
Furthermore, the players we brought in don't necessarily get brought in under Hughton or - if they do - they might not have got game-time. It is unlikely Hughton would have gone with two small but pacy forwards. His recruitment of Locadia suggested a like for like replacement for Murray and a continuation of 4-5-1. This - in itself - prevents the sort of attacking full-back play we've seen from Burn and especially Lamptey.
Chris did nothing to introduce pace into the side when it was patently obvious Gross and Murray, Stephens and Propper were just too slow. He didn't utilise Burn, while Bissouma was a peripheral figure throughout his tenure.
Had Hughton stayed I fancy we'd now be 19th - somewhere between Villa and Norwich.
The reason we can't answer whether it is right is the same reason you end the post with 'I fancy we'd now be...'. We don't, and can't ever, know what would have happened if he stayed. Yes, things looked dire in the second half of last season, but New year's day to March things looked pretty dire this season - no wins, dropping down closer to the relegation zone. Then we had a break and came back stronger. The 2015/16 season up to January we didn't win a game by more than one goal, we sign Knockaert in the January window and we start opening up, playing much more attacking football, and get 3-0s, 4-0s even a 5-0. The right signing(s) could have dramatically improved our performances and results, and this could have been the season Hughton pushed us on up the table, and possibly, with 8th place potentially being a European place, have us fighting for Europe, with the bonus of over £10m by finishing further up the table.
I'm sure I said it when the change happened, whatever Potter achieves with us, we will never know if we would have done better or worse with Hughton. If we were sitting bottom of the premier league with 12 points, we wouldn't be able to say we wouldn't have on fewer points if Hughton had stayed. So we'll never know whether it was right or wrong.
What we do know is that it hasn't cost us our place in the premier league this year, and for many people the football, on the whole, has been more entertaining than last year.