Hi Lewlew
Your Dad is very young to have so many things going on. It must be so difficult for you. I think the best person to ask about your Dad's situation would be the specialist doctors at the hospital. Cardiac, COPD etc
People with COPD can improve to the point of remaining stable even occasionally improve lung function in certain situations, those spoken of on the lung ed course (PR) but with any lung infection and pneumonia the condition ise then unstable, with hospital care your Dad could recover from being unstable.
The MRSA stays in the body I believe and people just have episodes with it, the doctor can explain more about this, or check the patient UK page on MRSA
https://patient.info/health/mrsa-leaflet
The cardiac issue only the cardiologist can advise the situation for your Dad really, it all depends on the damage and they will be able to advise what the problem is and how they may be able to help your Dad.
With a diagnosis of Type 2, the hospital diabetic department should be made aware your dad is in hospital as they will need to keep check on his blood glucose levels, pneumonia really mucks that up from experience.
I so hope your Dad gets all the good care he needs in hospital and he begin to make good progress towards recovery.
With all those health issues your Dad will never recover from them but he may well recover from this period of instability in hospital to go on to manage his many health issues successfully and enjoy living keeping his health issues stable. Its not easy managing different health issues but the main thing for him in recovery once he is permitted to go home, is a healthy diet, moderate but regular exercise, as little stress as possible and a happy frame of mind.
The hospital can refer to pulmonary rehability, cardiac guidance and advice, diabetic management course at the hospital and chat with a mindful psychologist at the hospital perhaps in helping him cope with the emotional and psychological side of his illnesses.
Best wishes to you and your Dad, I hope some of this information is of help to you and the awareness helpful for your Dad too.
Take good care of yourself as well