I just think that we'll look back in 20 years (or much much sooner) and find that permanent fixture embarrassing. It becomes redundant the moment that we get relegated again. If it was an FA Cup win I'd feel much differently. We shouldn't have been in the position where promotion was necessary in the first place.
There are classier things we could do with that wall space. How about offering memorial bricks, people purchasing a permanent plaque on a brick for loved ones who have departed? (an alternative to ashes being sprinkled on the pitch, which most clubs no longer permit due to pitches being half synthetic now and dug up and replaced regularly).
Or how about a feature which commemorates a club legend with a mosaic, with no random peoples names on it, funded by fans with profits going to a charity - just a single brass plaque saying "funded by fans to celebrate promotion 2014/2015, profits benefiting Cancer Research". To keep it on topic the mosaic could be of Bradley Johnson, player of that season, or Wes Hoolahan - widely considered the closest thing we have to a legend on the pitch at the moment (and three times promoted with us).
The fans have always dug deep when the club has been in trouble or needed a helping hand, and stuck by the club in difficult times despite relatively high ticket prices, and we've just won a £120m ticket to the richest league in the world, aren't the club pushing it a little with the goodwill thing?
And yes it was our first appearance at Wembley in 30 years, and it was nice that it fell on the anniversary year, but surely automatic promotion in 2011 and winning that division in 2004 were greater achievements, and yet did not get recognised with a permanent commemoration. We are a club which is big enough not to look out of place in the Premier League, we are probably one of those clubs which by size should be expected to float around the lower half of the Prem and top of the Championship, so we haven't done anything special or exceeded expectations here.
Now if Bournemouth want to permanently commemorate the time that they won promotion to the Premier League, their first ever promotion to the top tier of English football, then that would make far more sense as that's a huge achievement for them.
This is our 6th promotion to the top tier. Its the third one in 11 years.