Until your transaction closes, the termite issue belongs to the seller. Our recommendation is to review your purchase agreement relative to repair limits because of WDO's (wood destroying organisms) prior to having a complete evaluation done by a WDO specialist.
Once the extent of the damages and cost associated with remediating it is known, you will be able to understand what lies before you. Collect as much information as possible before pushing the panic button and remember that many transactions are saved through additional negotiations between the buyer and seller.
Be sure the seller knows immediately that this is an issue of great concern and will impact your transaction.