Definitely a standalone from what I can tell.
If anything will become expensive, it will be software. It's getting tougher and tougher to track down vintage Mac software on eBay, Amazon, and the other sites. (I may be partially to blame for that, as I tend to snap that sort of stuff up–I'm the guy who has four complete boxed Word 5.1s). Software usually got chucked instead of donated, as hardware did. I don't see hardware jumping too much in price soon (especially with low demand–remember how I snagged that mint PB190 not long ago and was the only bidder on a low-priced auction?), but there's definitely a scarcity factor involved nowadays. Last time I looked on eBay there were no LC 500 series, only a few Duos, very few modular Macs, and no PB150s. I think a lot of what we will get as collectors will now be relegated to collector-to-collector transactions, sort of like we have with old coins. When was the last time you got a Mercury dime in change?