With SLX, absolutely not! Partners were crying for a way to compete more or less directly with sf.com for 10 yrs. SLX couldn't really get to Cloud because it took forever to develop a decent web interface.
IMO, Sage purposely didn't move SLX to the Cloud because it was too cheap to adequately fund the development effort. Period.
The Web-Cloud product SLX has now is quite good. Whether it can make a difference at this late date remains to be seen. SLX once had a pretty good channel of decent-sized partners; it still does, but most now get most of new CRM rev from other CRM products, while making substantial $$$ servicing the legacy SLX (Windows-based) customers. Some gave up and became sf.com consutants, or (like Brainsell) added that consulting to its portfolio.
Also, SageCRM.com has been available since Sage bought ACCPAC 10 yrs ago. My understanding is that it has never had many customers, even now.