Totally agree. It would be a sneaky hit down the road.
Yeah, I'm looking forward to what they can come up with.
how can a patch make the gameplay fun?
Well if you don't like the core gameplay, i.e Explore, Fight, Trade and Survive then nothing is going to change that. A patch isn't obviously going to change the formula. Although I don't think the formula is bad on paper, just poorly executed, things like the sentinels aren't really fun to "fight", but they could be made to be.
But it can make improvements to that formula, minor complaints like button bindings, inventory slots, FOV etc are easily fixed.
Also things like variety in general can also be patched in, perhaps more "quests", even more variety, more enemies on certain planets, more NPC's, more story driven interaction with said NPC's (afterall in a recent patch they re-wrote the Atlas Path).
I think you're really downplaying what can be changed in a patch. It might also be worth reading this
LINK to get an idea of what things they've changed already. They added new gameplay mechanics, like brake drifting and critical hits to Space combat, added Bounty missions and larger space battles.
If they're already making changes like that I don't think it's unrealistic to imagine them adding even more to do on planets.