Should we ditch our theme?

My company purchased and is using a WordPress theme from a fairly new developer who has only created a handful of themes. The one we’re using has only had about 250 total sales; the last update from the developer was in July (so not since the new WP updated).

One web designer we talked to recommended that we switch to a different theme with a more established developer and a product that has better sales or we could experience lots of issues, lack of releases, security problems, etc. She is concerned that our theme isn’t secure, reliable, easy to work with, etc.

Unfortunately, this was chosen by a different web designer who never raised these concerns with us, and we just spent a lot of time/money launching our website with this theme. That said, there’s more work to be done it.

Is it worth us taking the hit and switching themes now? Or sticking with the current theme for a year or two? Any thoughts, insights, suggestions?

Thanks!