This move of the central banks to hold their reserve on Bitcoin is a promise to drainage other institutions to adopt the strategic the strategic reserve as well and once they do, it is sure of turning out to green lightening to the Bitcoin market in the main time.
I said main time because because on the series of adoptors buying Bitcoins gradually and steady is also how steady and gradually Bitcoin price would keep growing.

Therein is point we would even find the impact of those institutions which have not been able to buy Bitcoin yet because when the finally buys the Bitcoin in the future would contribute to further increase of Bitcoin.

So indirectly these slacking institutions later to adopt Bitcoin will also act as reserve of Bitcoin values as it would perform series of market increases but if every of the expected institutions come to adopt this strategic reserve at same time, the green lights of Bitcoin would come to a time of reaching it maximum price as there is no value of further adoptors that is weighty enough to bring increase to the markets.

Note: the regulatory compliance police states the central banks would not exceed to have it reserve on Bitcoin above 2%.
Although the future promises of Bitcoin price is not pegged on just the banks but also as the private institutions but while we considers the leadership of the governments facilities adopting Bitcoins, it as well encourages the private institutions to follow the trends. Let us also be aware that most of the institution resources are in corporation with the government with Central regulations.

Symbolically on this mode, the green lights will ever turnup even after the so yello or red lights. Then there should be that valuable reasons of adoptors to dive into the Bitcoin market.