Don't get your hopes up. Future games will have to load much more data than current games, so the net benefit of the SSD solution will probably hover around 0. Basically similar to how mandatory installs didn't solve the problem of loading times on the PS4 and XB1, but were merely the solution to circumvent the slow Blu-ray drives and keep loading times in check.
It's important to remember that Sony's demonstration a few weeks ago showed loading times for PS4 quality graphics on the PS5, but PS5 quality graphics will obviously be notably more demanding and have longer loading times.
Another important factor is the individual competence of any given development studio. Just because loading times can be kept under control doesn't mean that every game will be that way.
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