Poland was one of the most powerful nations of Europe for 700 years
I think Poland had latent power that it never harnessed effectively.
What do you measure power by anyway? Armed forces, political stability, foreign clout? - or a combination of all these and others.
It's a pity Poland devolved after the death of the last Jagiello. European history would undoubtedly have been different and vastly so.
It should be remembered that time passes and nations that are now all powerful fade away and memories of former grandeur again become reality.
I believe that Poland will once again adopt its paramount place in the world as what it was once described as several centuries ago - "the most human of nations". This phrase surely holds more meaning and purpose than any other.