Please note the following points:
1. The four Imams (Rahimahumullah) are not the only ones with Madhahib, it's just that they are the most known. There are also others such as: Sufyaan al-Thawri, al-Layth ibn Sa’d and al-Awzaa’i (Rahimahumullah).
2. There's no need for more Madhabs to emerge, because between them, the above imams have pretty much covered everything that needs detailing or explaining in Islamic Fiqh.
3. Salafis (or should I say Ahlus-Sunnah Waljama'ah) do follow the Madhahib mentioned above, but not fanatically!. They rather follow the strongest evidence from these Madhahib in each particular case.
To all the brothers and sisters here: May Allah SWT accept your fasting and praying in the Blessed Month!!