I'm not of that view. There are other alternatives beyond the binaries you offer. I actually think Connolly should go out on loan in January to prove himself at a higher level. Either the Championship, or something similar to Hoffenheim would be the best option.
We play one up-top. Murray is in possession of the shirt at present, Andone offers an alternative and deserves the chance to prove himself. Locadia is, how shall I put this, a 'work in progress'.
Murray isn't going to last too much longer. Finding a replacement is going to be extremely difficult, and we'll need a range of different players who can play up front. I think that Connolly could be in that mix, but he hasn't done enough yet to demonstrate that he'll be able to bang them in in the PL let alone contribute in other areas that the role requires. If he can prove himself at Championship level or a decent league like the Bundesliga, he ought to be included permanently in our 25/18 next season (when still a teenager).
I am hoping he doesn't go out on loan. He got on the bench in the Caraboa Cup v Southampton. So who knows if you get lucky and get a couple of lower league teams in the early stages of the FA Cup. Who knows he might get a run out in the first team but if he does, like any player, they need to grab it almost immediately because competition is tough at PL Level.
Aaron is apparently a very special talent and sometimes it is easier to monitor their progress by keeping them ''in house'' - Also it depends on the temperament of the individual. For Solly a few years ago, it was deemed a better option to keep him around than send him out on loan and he became a regular first teamer by staying ''in house''