Pure conjecture here, but my crystal ball tells me they will continue to grow CLE a bit as a pilot base.
They know, at this point, that they can’t fill NB CA slots at EWR. If they offer 15 more slots in CLE, they’ll have more than enough takers. The good news for junior CLE FOs is that all those new CLE CAs will (mostly) come from the top of the CLE FO list.
Same goes for DEN and IAH, but those bases are more complicated by having multiple fleets.
CLE is likely pretty straightforward to predict.