So I pointed out to the limitation of the wafer processing. All those improvements are about yield, purity leading to efficiency. Sorting is a mechanical process of finding efficient material, by measuring tools in automation or by hand using tools to recognize characteristics required to process it further. The percentage of quality wafers is less than total production. Cell is based on 100% quality material based on your design needs. This is where the technology takes a hold of wafer and can make huge difference. There is process damage and its elimination is also a factor measured. In module you lose some or more of that efficiency tightness to processes or chemistry or physics, all affecting costs and ultimately leading to greater conversion or lack thereof.
There are so many options, that none of them is clearly the lead, MWT and the PERC, PERL etc are some of them, in case of cell processing.
As I mentioned for revolution requirement you need in-house, technology design. How you get it is not by way of Applied Materials, which by nature of it is for sale to wide spread of operators, eliminating differentiation. I also said that wafering internally is a cost as opposed to add-on value, today. As the necessary evil Yingli cannot stop developing its fully integrated value chain, to not stay behind. This explains its ingot improvements. You will not see wafering capacities grow, but you will see cell and module eventually, while mass produced wafers will be bought by their specs and its limited availability will be essential in creating new relationships among companies.
In case of SOL their path includes building relationships with companies to offer SOL cell technologies to keep up with the market trends. However in my scenario, of in-house created advantage, the top players will leave the solution providers behind, another words leaving the purchaser with secondary or as we see today, vanilla type equipment accessible to all. I would be looking for cell developments and module developments from companies which have a selling channels, brand. There could be exclusive agreements, and cooperation deals precluding for years technological expansion to others in specific or multiple of faucets. Naturally because of it, equipment costs will raise again. Equipment manufacturers will want to overcome leaders and attract purchasers. However due to limited buying pool, pricing with have to come up to make those efforts viable. Again top players may buy those and make them exclusive to close off other operators. Of course there will be as many other scenarios as participants and human ingenuity allows.