Yes, it uses the word will, but it takes time to prepare for the future. It is arguably so that, currently, EV does not really improve that much considering the average electricity plant in the world. But, we cannot ignore the future just because we live today. The fact is that we have to face the realities of today and the inevitabilities of the future.
Granted, an individual cannot really plan for the future in the same way as a society can, which is why a person not switch his brand of cigarets because of long term benefits. However, assuming either your private or public health care system offered you discounts if you switched your cigaret brand (or extra taxes on the old brand), because society see that on the whole, they will save money this way, would the average smoker still not switch, even if he/she saved money here and now?
As I mentioned, a society or a larger organisation have the ability to plan in long term in a way that you as an individual cannot do. Though the society can influence you to make the "right decision" in various ways. Meaning that, even something that may not make sense for an individual today from a utilitarian perspective, will make more sense from a financial perspective. In other words, society can plan for the "will happen" part and ensure that the current realities, at least in financial terms align with the future and the "will happen" part.
In addition to this, the fact is that infrastructure take a lot of time to build. Therefore, in order to build the infrastructure for the future, we need to invest in it today, because rest assured, at current consumption, oil (and natural gas) WILL run out (in reality it will just become ridiculously expensive, but that only gives us some additional time for the transition). When that happens, there better be a working infrastructure for EV (including fuel cells) in place, because neither coal nor nuclear is viable for direct installing in cars.