Yes, sounds like this could be a wise move. My dad (now 95, living alone in his 3-storey house since mum died around 7 years ago) had one installed a few years back, and although he doesn't always use it, it's invaluable for the times/days when he's feeling that bit less mobile. Without it, he couldn't have stayed in the house -- and leaving it is almost unthinkable. (Sure, some day there may be no choice. But it has unquestionably given him additional years of independence and stability in his own home.)