The situation has improved in Uttarakhand.
A trans Himalayan road is also under constriction in Arunachal Pradesh which will run parallel to LAC in the inner areas thereby facilitating inter valley movement.
Helicopters can only take care of small tactical lifts and transfer of troops and equipment not large movements..
The
Trans Arunachcal Highway will surely strengthen the communication in Arunachal and its making good progress
However its the 1800 km
Arunachal Frontier Highway which will almost run parallel to the boundary/MacMahon line which will truly change the story as shown below. All forward areas will get east-west connectivity allowing Army to reposition troops easily. But its still in planning stages
https://www.indiatoday.in/india/sto...-mcmohan-line-home-ministry-223219-2014-10-15
You are correct about Uttarakhand. The Chardham Road (7 roads in total) under the guise of pilgrimage/tourism are actually to take care of China. Also the recent Darchula-Lipulekh Road will add to the Tanakpur-Pitoragarh road
All the
three "disputed" areas of
Pulam Sumda(Mana Pass), Barahoti(Niti Pass) and Lipulek Pass will get enhanced connectivity and allow Joshimath and Pitoragarh based army units to take positions quicky
Add to this the expressways in UttarPradesh which will allow Army to move its hinterland units quickly to other areas
Chardham road and some UP highways will be done by 2021. Chinis will have tough time here.
North East is a long way to go. Lots of work remain.