I don't think half the machines in the game could run those maps
Well, we have all these fancy new graphics options in the game but no one is forced to use them.
Players with old computers just have everything turned down to low detail, and the beautiful new terrain would look to them just as bland and terrible as the current terrain does on low detail.
Make two different arenas, one for people with low-spec computers and one arena with mid-range to hi-spec computers. Afterall its 2013, amazing things have happened within the field of graphics card development, and prices of new cards have dropped aswell.
I don't think 2 different arenas would be necessary - except if HTC were to come back and say, amazing terrain like this on a large map the size of say, OzKanzas, would be too much
Then I would say personally I would rather have two or three smaller arenas with great looking maps, rather than one big map that looks terrible...but that would be just my opinion and a lot of people more interested in the 'win the war' side of the game would probably disagree