Making a tremendous presumption, that the conversion was done with the care and attention to detail shown in the restoration, and that the results on the screen (BIG and small) will be very good... that they did it right! (Maybe even becoming the new "one to beat", setting a new standard that shows the advances/capabilities in conversions now attainable.) The investment made in the conversion, will be made in the Blu-Ray sales, not the box office take. Word of mouth about the theatrical release quality will fuel sales numbers to some extent (theatrical tickets as well as Blu-Ray sales) naturally.
Not to hijack the thread down the "double dipping/triple dipping" arguments (I know! Oz VHS, DVD, Special 70th Box Set Blu-Ray right here!) There is going to be some reluctance by many to spend the money for the Blu-Ray, and that is where the word of mouth from the theatrical release may become a deciding factor. If they did it right, it will be added to many enthusiasts library. (I will undoubtedly add it once the price is less than $25.00, if the reviews are good.) I feel the studios are counting heavily on Blu-Ray sales.
And remember, if it's profitable for the studio in the end, it opens up more doors for conversions, and more double dipping/triple dipping profits