I don't think so. Purely anecdotally but being from Poland when I hear pan-slavic I imagine a North-south belt starting with Baltic states all the way to Croatia that somehow borders Russia which is a separate entity.
Yes, a unified political and cultural counterweight to Russian authoritarianism (with the inherent advantage of having massive links to highly developed and democratic Western Europe) would be very helpful indeed. A Pan-Slavic interlanguage can usefully contribute to that goal. It's not a "bad" effort at all.