I think in one year probably 2020, extension was proposed for Pune ERS weekly till Kollam which was rejected saying that Kollam does not have adequate facilities for watering etc. In the next year proposal ws sent for the biweekly Pune -ERS express which reaches ERS at 8pm. That proposal was rejected as it would have reached Kollam at odd hours and the return dep would have been around 2am which was also very odd. Looking at the timings most likely the weekly Pune ERS ( via Belgaum) is likely to get extended in future