They’re definitely not going to just have the one show, if history repeats itself. TNG/DS9/VOY/ENT were all overlapping by a season or two each.
I can’t imagine they’re going to just have a young adult show, a Michelle Yeoh Section 31 movie or whatever, and then nothing else. There’s definitely no way Prodigy is part of this plan, especially if Netflix is the one seeking to fund it. If three things are ending, then they have the production budget and staffing to produce three more different things. Star Trek is one of their most valuable IPs, it would be hilariously terrible if mismanagement led to it just totally floundering.