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.
And you can cut servers as people end up using devices less on their own.