Using non open source tools is Harlech ever a problem. Yes the support can disappear, but so can one for FLOSS software. I am working on a tool which is based on a graveyard of abandonned open source libraries and taking them over is absolutely not an option. The only thing you can do is to slowly move to an alternative and hope that it will get maintained. With tools the choice is usually very easy because you can switch to other tools any time.