I think its a good thing. More attention to themselves, no attention being drawn away towards PS4.5 or the 100s of games at E3. Gives them time to prepare fully as I presume they are not.
In terms of damage to their brand, its been done already, for like the past 4 years. Skipping E3 this year won't do them much more harm, especially since Zelda U alone is bigger than all of the E3 games they had playable last year combined.
Either way the difference is negligable.







