There was a time people thought that a 56kbps model was as good as it got, cause there was no need for high speed or to stay connected to the internet.
Of course there will be a time when LTE will seem as slow as 56kbps. I'm not saying we should just stop and declare LTE "good enough." That would be stupid. One day we will want to be able to download large lossless audio and 4K video onto our huge rollup-able iPads. But right now, at least for me, I would much rather see improvements to non-mobile internet, and for iPhones, much better battery life.