Sure. All you need to do is become more popular and trustworthy than github, a Twitter user with a metric craptonne of followers, cheap Chinese toy walky-talkies, YouTube "cute baby" videos, a talk page about the LY country code top level domain on Wikipedia, etc., etc. Oh, and you should probably expect to find a talk.ly Silicon Valley startup popping up every once in a while as well. (It'll die, like most do, but when the year is up and the domain becomes available again, someone else will give it a try.)
In other words, you've picked something that's pretty common, and the chances of you becoming the go-to site for the keyword "talkly" are very, very slim. And if you use any of the usual SEO tricks to climb the rankings inorganically, you will be hit with a page penalty. Like RapGenius, which got a "-30" -- that is, they would show up 30 pages later in the rankings than normal -- for soliciting links. It took a lot of work for them to fix it, and they pretty much disappeared from the Googles for a couple of weeks. And that was for a site that normally ranked #1 or #2 for any given lyric search.