Will bitcoin fall from the top spot as the most popular currency given that newer faster forms are being developed and if not what do you think will happen?[/b]
Very difficult to tell, but it is certainly possible.
It is likely that other coins will have far more utility, not just the faster coins but also the platform coins. Smart contracts for example, so ETH. IoT as well. The coins that service these and numerous other markets will become increasingly important.
Bitcoin looks destined to be simply a store of value coin. Whether future developments (Lightning Network etc) will change this is hard to say.
If I had to guess, I would say ETH or XRP might take top spot in the medium term, and then possibly an IoT coin in the longer term.