Web and mobile are very similar since most mobile web applications are in fact web apps running within a minimalist native host shell - this shell just acts as an interface to some web browser.
{some might argue that LinkedIn just chose to switch to native apps instead of a HTML app - hey, do you have as many clients and requests as LinkedIn?}.

If desktop + web / mobile, you can consider VFP + foxincloud.

With FoxInCloud your app runs on the desktop as usual AND on the web (desktop, tablet, mobile, etc.) with standard HTML/CSS/JS. You don't need to learn all the web techs at once - you can slide into the web world gradually, build additional competences on top of your VFP knowledge as opposed to dump your whole knowhow.

> I know many people that are creating new apps in VFP. But this is better answered by looking at your customers. Do they want desktop apps? Web apps? Mobile apps? If web or mobile, I wouldn't go with VFP. If desktop, the answer is "it depends". Are you willing to bet that VFP will continue to run on Windows in 10+ years? Are they small companies? If yes, then VFP may be a good solution, but so will lots of other technologies. If no, most large corporations don't want to see VFP.