If I had to guess they probably will switch to 
both a combo of digital and traditional animation 
techniques, if they switch at all. This seems to 
be what most Japanese studio houses have seem to 
do. The one's that have supposedly switched 
entirely to CG still use some cels for certain 
shots and effects.  

As has been pointed out in previous e-mails, 
digital does not do a good job for all situations 
and traditional animation can become exorbinately 
expensive to do for certain shot time (for ex, 
character and background both moving). What we 
will probably see for a good number of years is 
both techniques being used. However, the advent of 
digital animation and its growing populatity 
with Japanese executives (mostly because of cost 
custing) is definitely signaling the end of large 
amounts of cels being used in Japanese animation 
productions. 

My two cent,
Marcus