First post in ages, nice to be back!
This argument goes on every year and I guess nothing would suit everyone. I personally would prefer remaining on summer time (CEST over here) as I detest the sudden plunge into darkness (sat here working now at sunset is not nice!).
But I do understand why people prefer GMT in winter, it does help in the three darkest months in making mornings be a little better although with so little light it isn't easy.
Certainly staying on GMT (or CET here) would not be sensible. Sure solar noon would be at noon and perhaps we should follow the sun patterns more. But the reality is society is skewed towards PM. Little wonder given that 10-6 are considered core sleeping hours (not 8-4 say), public transport often stops around midnight and starts at 5am and office hours are often 8:30-5. All shifted later.
Also almost everyone bar shift workers are awake in the early evening but only those who have to/like earlies/have kids are up at 6am so surely it makes sense to try to give more light later to save on energy costs? This effect is even more pronounced in late Feb and into March (clock should return to summer pattern a month earlier!).