Satellite TV will be around for several more years before the customer base shrinks to the point that it makes no economic sense for AT&T or Dish or *somebody* to continue offering it using the satellites that are already in orbit. But, yes, five years from now, I do think that satellite TV will look like a sort of niche thing for rural residents plus commercial establishments like sports bars and hotels. AT&T's CFO said on a quarterly earnings call earlier this year that "the company will continue to rely on satellite video delivery for rural areas for the foreseeable future." But between T-Mobile's plans to offer 5G home broadband over their new 600 MHz spectrum starting in 2019, plus multiple companies including SpaceX aiming to offer global low-earth orbit satellite broadband in the early 2020s, plus local rural co-ops, white space wireless broadband, etc., the US population who can only get pay TV via DirecTV or Dish is going to dwindle over the next several years.
A year from now, I expect that pretty much all of AT&T's marketing efforts and pricing incentives will be directed at their OTT services, with satellite TV being a largely unadvertised back-up option for those customers who require it. It's certainly possible that free installation will no longer be offered for new customers at some point. Perhaps AT&T and Dish won't even handle installation directly themselves in a few years, leaving it up to self-installation and third-party installation. I can imagine AT&T choosing to spin off or sell their satellite TV business after they have migrated the bulk of their customer base over to IP/OTT-based TV platforms. Perhaps it will merge with Dish's satellite TV business, either under Dish itself or under a third party.
At any rate, I think satellite TV (DBS) is in long-term decline but, for those who want or need it, I don't see it going away until the mid-2020s at the earliest and the early 2030s at the latest (at which point DirecTV's current fleet of satellites will be largely exhausted, or so I've read).