They just needed to strike up a deal to get all out of market games, and all in market games for teams MLB is producing on ESPN unlimited with no extra fee. Get people used to watching like that, and have games available and promoted to a large audience, make some ad revenue and grow things from there.
They are pennywise and pound foolish with this approach and making a big mess of everything. The out of market subscription fee brings in some revenue, but it is spread across all the teams and probably isn't enough to afford a decent 7th inning reliever for each team. Same goes for the amount of revenue charging $100/year for in market streaming which might raise enough to get a middle inning reliever.
They need to get eyes watching, and having a bunch of confusing streaming packages that seem expensive to all but the most rabid fans is just shooting themselves in the foot. They don't need to worry about keeping the cable RSN golden goose money any more, so go do something that gets the teams exposed at least.