^ I agree on that take: OP should clarify what exactly bothers him the most.
in terms of its speed and fees. Will there be any issues
Speed? In what sense? On average, it takes 10 minute to mine one block and whether we have trillions of transactions or a few transactions, nothing changes in terms of speed but in terms of fees, everything changes if we don't increase the block size and keep the current one as low as it is right now.
If Bitcoin becomes popular cryptocurrency for transactions, then there might be some changes but there should be strong reasons for that, sudden price pumps aren't enough to convince the community to change the block size.
If block size increases, there will be more space for more transactions but nothing will change 1 confirmation per 10 minute.