Interesting - tell Mastercoin and Etherium just how much of a "one trick pony" bitcoin is, and they'll tell you all of the ways their technology is built FROM bit coin's concepts and extends its capabilities, a symbiotic relationship. They don't aim to replace bitcoin, but extend its functionality. Bitcoin can and will evolve. What is this "one wallet type" thing you're talking about? There are a wide variety of wallets that work with bitcoin and they will continue to become more user friendly, just like any software. The block chain could never handle it? Again, you haven't been paying attention to the efforts of other efforts that won't add excessive bloat to bitcoin, but will still manage the same goals.
Since Etherium is basically vaporware, not really much I need to say to them. Mastercoin, is building on a blockchain that doesn't scale so, not sure what you'd like me to tell them, they shouldn't already know. As I said, innovation won't stop. I love to see people pushing far beyond Bitcoin but the question of if Bitcoin is a one trick pony, is an easy yes, as was described above. You can challenge that idea, once it actually does do more. Dreaming of doing more, is just that...dreaming.
As for Bitcoin's usefulness and how it compares to the utility of the internet, I think you're way off the mark there and probably don't truly appreciate how it can potentially serve as significant leverage against central banking and corrupt governments. In that way perhaps its the most important technological advancements in our lifetime.
I guess because I don't care about fighting ideological battles against "governments". What I care about is bringing real-world solutions to the unbanked, under-banked and the millions economically oppressed around the world. Bitcoin doesn't solve that, because it's poorly distributed and lacks any desire or mechanisms to merge with current financial infrastructure, to actually be useful to people in 3rd world countries. Look, Bitcoin does what it does but it is not an end all be all solution to the worlds economic woes. It's just the place we started. From a technical standpoint, if we're still talking about Bitcoin (beyond once upon a time) in 50 years, I'd be very disappointed in our abilities as humanity, to innovate.