I have been thinking about this recently, what Will happen if Bitcoin network gets too big? Will there be any issues with it's speed or fees
The Bitcoin network is already massive, handling almost half a million transactions daily without major issues. There’s no need to worry about the system crashing, because this isn’t a centralized setup, it's decentralized. With thousands of miners distributed globally doing the work, the network stays secure and resilient. In short, downtime is highly unlikely.
I agree.
More worries are currently about how much the retailers, common people would possess BTC and their proportions to bigger entities in the long run in the eco.
However, that's too a question that would be developing over the years, if not decades to come..