Of course Attack chopper's primary role is to support mechanized columns and ground units but my point being PLA has hundreds of these to support their formations on LAC along with active UAV/UCAV support while PAA is likely to induct more since their initial attempt to procure the T-129 involved decent numbers if reports are to be believed
Even now, the initial batch of Z-10MEs' are numbered at 25 but will of course go up and probably number in the hundreds while we simply do not have enough to support our tank columns distributed between eastern & western theatres
Your question was - are we going to order more LCHs now in response to Pakistan' acquisition of Z-10.
And the answer is no.
Pakistan already possesses nearly 50 AH-1F Cobras (unclear how many are operable) and the acquisition program for new attack helos was always meant to be a replacement for those old ones. So in the end, the net number of helos is not going to increase, in fact in the medium term it would actually decrease.
Plus, the acquisition program for new attack helos on part of PA is nothing new. They've been working on it for over a decade, the initial plan was for AH-1Z Viper, and those actually went much further along the pipeline (airframes intended for Pak were already built) before US blocked the export at last minute.
The LCH procurement will happen along the lines it would otherwise have. As would any follow-on orders for AH-64Es. The acquisition of Z-10 is neither going to change the dynamics nor present any paradigm shift.