I had great experiences using a 'game maker' on my childhood (RPG Maker 3 on PS2). However, I couldn't share what I made, so I started seeing the hours of work I'd need to make something substantial as a waste.

I think having an easy way to share your game should be a priority. Clearly the web can be used to emulate and share almost anything now, so some kind of exporting system and web player would be ideal.