I think you just found a inescapable vulnerability, what if someone sets up two accounts and they just send bitcoin back and forth. It would crash the system. I can see no fix.
This has been discussed. The fix is transaction fees.
Knew there had to be a fix somewhere thanks. When do transaction fees kick in.
Transaction fees have already kicked in. Right now, we still get a pretty quick response even if we don't pay transaction fees. But if the network ever started getting clogged, you could pay a small transaction fee to be given higher priority. In the future, it is possible that transactions without fees take days, while transactions with fees go much quicker.