New idea feedback

Hi all,
So i like building b2b tools in my free time.. i built a mockup / product planning environment inside a browser extension with the idea that eventually people will want to plan their website on top of the actual website instead of white pages / 3rd party software.

I think someone will eventually lead the revolution back to business browsers that pack all the features of productivity sites like mockups and task management but it's a big tool to make and my mind is drifting to other things :)

Anyways.. over the last days I've been thinking about making a small marketing calendar app for email/sms/chat etc marketers that would let marketing teams collaborate on campaigns in a pleasant,structured way.
Let people upload html templates on the dates they’ll launch, up/down voting content/graphic proposals and more similar functionality.

Instead of rushing to build I thought to engage in a discussion first :) and see if tech founders see value in this tool. So what do you all think? Worth the effort to go ahead with this?