Earlier quoted context omitted.
"What services are safe to invest time and money in using?" Great question. I think in this situation, a company like Dropbox is probably safer, as they're a lot bigger in certain measurements (amount of funding, amount of revenue, etc). I think the companies that have the most to lose are the safest to invest time and money in using. A small startup that just started 3 weeks ago is more likely to be sold than a comp…
The problem though is that if everyone waits around for services to become established, then no service will be able to grow to the necessary size to become established.
I think there will always be early adopters to help startups get their initial traction.