Might as well make it 20 years. For something like a remote control you can fit 100k users on a server, and a little bit of money per device can go an extremely long way. Extra large ec2 servers (which you can easily do better than on cost) are about a thousand dollars a year, and you only need a few hours of sysadmin work per month across the entire fleet.
And you can cut servers as people end up using devices less on their own.
