Looks like something similar to nowadays events with alt-coins already were in the history of humanity.
What can stop Stamp collectors from creating new stamp? Theoretically, there is finite lumber on the Earth, finely, finite number of the atoms around Sun.
Compare to alt-coins, there is finite number of tcp ports, 1-65535. However, any alt-coin can take original bitcoin's ports.
Finite number of IP addresses, however, there is IRC protocol in the base of bitcoin protocol, probably, only one node needs in real IP, may be no one.
An Enter to the market for new alt-coin appear more and more friendly. Probably, once, user would chose couple of params, Number of coins, delays, ports, name of alt-coin, and Logo. Push the button. Alt-coin ready. User will only configure his GPU/CPU to make the life in the block-chain.