Anything is theoretically possible - the pessimism with the Afghan experiment is, as I mentioned, because a lot of different factors require alignment over time with a small to non-existent foundation to build upon. The Iraqis had significantly fewer issues to deal with and plenty of resources to throw at their military, but were undone by corruption and sectarian divisions.
Long term planning and investments in institutional capacity building (regular equipment purchases, maintenance, personnel facilities and training etc) require some level of confidence in revenue projections. Afghan revenues, especially for security, are overwhelmingly dependent on foreign aid. The overwhelming majority of that foreign aid running into billions of dollars annually (to sustain the Afghan security forces) is entirely dependent upon the US at the moment, and there is no concrete long term commitment from the US to sustain that level of support. The EU and Asian countries should/could commit to financial support for Afghanistan and reduce the US burden, but there is no long term commitment there either, nor any strong interest or domestic public support to do so.
The alternate would be domestic revenue growth in Afghanistan (taxes, duties etc) that offsets the loss of foreign financial support, but that itself is dependent upon economic growth which is tied to improved governance and security. There are so many variables involved here that forecasting domestic Afghan revenue grow is largely pointless. The pessimism is therefore entirely warranted.
It's not a simple matter of just handing over X number of platforms. The US went through this whole process when they investigated handing over (for free) surplus military equipment to the Afghans. The fact that they chose to scrap a lot of equipment because the Afghan security forces simply did not have the technical capacity and/or discipline to maintain said equipment illustrates the challenges involved.
The Hinds will require extensive training for Afghan pilots, technicians and maintenance crews along with broader doctrinal and tactical integration of such platforms into the Afghan military (which will involve additional investment in training and equipment) with the associated technology to get the most effective battlefield application out of these platforms. Are the discussions between Afghanistan and India, regarding the provision of new equipment, also focusing on the other associated critical requirements, whether in concert with the US/Russia or independently?