I'm being neither optimistic or pessimistic, but rather acting on data. I've been consuming content this way for more than 15 years. There has never been a merger or consolidation that I can point to that ever impacted this use case, in my experience.
It's like complaining about data usage or pricing or something - it's a solved problem, I have unlimited data, and if it gets too expensive then I will change my habits and spend my money elsewhere. I won't raise the specter of data usage and pricing in every topic that it's remotely relevant in. That's how I see the point of consolidation - it's not new, and hasn't impacted the space to date, so where is the reason to be concerned? If something changes as a result (fewer players, so trying to raise prices, for example) then I speak with my wallet and rely more on streaming libraries and promotions. If streaming services are too expensive, again, I speak with my wallet and subscribe more precisely instead of maintaining a library of services to access when things were cheaper.