Once upon a time there were many Madhabs i.e. Madhab of Imam Auzai (RA) etc but almost all of them either got subsumed or died out (as not enough transmission) was done by students.
In the last 40-50 years due to Shaykh Al-Albani (HA) and Ahl-e-Hadeeth in India/Pakistan there has been renewed interest and uptake in the Dahhiri Madhab of Imam Dawud bin Ali bin Khalaf al-Zahiri (RA), although neither are strictly Dhahiri (they deny it actually). Ibn Hazm (RA), Imam Shawkani (RA) had significant Dhahiri leanings in the past.
Once upon a time Dhahiri Madhab was a School with literature, methodology etc but today although we have very few (even fewer then few) Dhahiri Ulama not sure if we can call it a School (it is mostly defunct).
Today we have four (4) Madhabs which are active and thriving.
This cannot be undone and I am sure it will be greatly appreciated.