Dearie me. Yet again, you're displaying a remarkable amount of ignorance when it comes to Polish law. I suggest that you should consider the name "Legal worm", as it would be rather more in line with your level of knowledge.
The President of Poland has broad powers to confer, or not confer citizenship.
Correct, but only when it comes to the citizenship path that involves applying directly to the president for the award of Polish citizenship. The naturalisation path that the majority of people take does not involve the President of Poland, but rather an application to the provincial administration. The President of Poland does not get involved in these decisions, as the competence is devolved to the provincial administrations.
He might well decide to grant Polish citizenship to a prominent academic like Norman Davies without requiring that he renounce his present citizenship.
That only applies to people that apply directly to the President. It does not apply (and the President has no power of veto) over those that apply through the provincial administration. In fact, the law is so clear that an applicant for Polish citizenship may be awarded a positive decision on the spot if the administration feels that all the documents are in order and do not require further investigation.
Regardless of what was true under the PO regime, the new President and government can be expected to act more cautiously before conferring citizenship on foreign malcontents.
Unfortunately, the competence for granting citizenship through the naturalisation path lies with the provincial administrations and not the President or government. Of course, understanding this involves understanding the structure of Poland rather than writing nonsense from several thousand miles away.
Fortunately, Poland realises that there is no harm in granting citizenship to hard working individuals that contribute to Poland, and the new government is highly unlikely to amend the legislation surrounding Polish citizenship.
In case you're struggling to understand the law : Foreigners can be recognised as Polish citizens through naturalisation, or they can be granted citizenship by the President. The two are not the same, as the first category is a right and the second is a privilege.