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The Disney Dining Experience
is wholly separate from the Disney Dining Plan and not effected by the "Free Dining Plan" Package Promotion.
I believe you are asking about what effect will the "Free Dining Plan" Package Promotion have on the Deluxe Disney Dining Plan if the promotion is offered again this year.
If so, It can't be said with certainty what Disney will do with future promotions, but they may provide an upgrade option judging by similar past situations.
An "upgrade" option was previously offered to Guests who were eligible to take advantage of a "Bounceback" Promotional Package
that was essentially the same discount as the "Free Dining Plan" Promotional Package.
Guests were able to purchase the Promotional Package and then upgrade the package to include the Deluxe Plan at an additional cost of $32 per adult per night and $10 per child per per night.