They are nice old machines. Designed to last forever with normal maintenance. As you know, straight stitch only and no reverse. Once everything is set, they make wonderful stitches. Pretty much anything you could ever need for it is available as new repro, old stock, or used on ebay.
My mother used her grandmother's into the '70's before she got a modern electric with zig-zag. She made all sorts of stuff on it. They were designed back in the treadle days and don't like high speed. With reasonable care, hers was 100% reliable and never saw a shop as long as she could remember.
If you like the antique machines and would like to be able to use it, by all means keep it and use it. It's got a lot of harp space. I've seen them being use for piecing quilts and even free motion quilting. If it's a treadle, you can still sew when there is a power cut if you can see.