I always enjoy the digital vs. acoustic piano debate and can argue either side.  I only started playing 2 years ago at age 40 and it will be a long time before the poor quality sounds coming from my piano are only because it is digital and not acoustic.  It’s the same reason Tiger Woods golf clubs wouldn’t improve my golf game or Lance Armstrong’s carbon fiber bike wouldn’t improve my riding ability.  (maybe we should debate if great pianists are born or made)

If the only criteria were sound quality I would have gone for the acoustic.  I opted for the digital because I can use headphones after the kids go to bed and I can record my songs in MIDI format and transfer them to my PC.  I bought a high end digital piano and I believe the mechanical action of the keys and pedals is similar to a conventional piano while the acoustic quality is not as good.  If I compare my digital piano to all the pianos that are not in tune and need some amount of service then the difference is even less obvious.