5 reasons why it's roughly impossible to effectively replace the Volkswagen Beetle
It's no surprise the Volkswagen Beetle was quite revolutionary at its time, and became an effective contender to the sidecar rigs which used to be the mainstream "people's car" of Germany. But its success was not confined to its native country, to the point that it's still a fairly common sight in Brazil. Be it a "Baja Bug" or something closer to stock, the "Fusca" is an important part of the modern history of the country. Its local production, originally phased out in '86, had even been resumed from '93 to '96 at the request of former president Itamar Franco. Well, it was not so successful at this reintroduction, basically because most urban buyers tended to prefer the then-modern "people's cars" which were nothing but impoverished versions of random compacts such as the Fiat Uno and the Opel Corsa. However, there are at least 5 reasons why the Beetle is effectively irreplaceable.
1. - Ease of maintenance: the simple mechanicals requires fewer servicing than a water-cooled counterpart, plus it's one of the easiest engines for novice mechanics to learn the basic concepts of internal-combustion engines. Its perceived lack of sophistication then becomes somewhat advantageous.
2. - Ruggedness: this is still a desirable feature for many owners who may not be so mechanically-inclined, or who may go through harsh riding conditions. The air-cooled engine, which also has a gear-driven valvetrain instead of chain-driven or belt-driven like most modern cars, was developed for the Beetle exactly due to its resilience to harsh environmental conditions such as the extreme cold while parked outside when no heated garage (or no garage at all) were available to prevent ice damage to a radiator or even to the engine block due to the lack of antifreezing radiator fluid back in the day...
3. - Off-road capability: maybe one of the most noticeable reasons why the Beetle remains popular, with the "Baja bugs" as one evidence. The rear-engine rear-wheel drive layout enhances the traction in loose surfaces, plus it's quite easy to adapt selective rear-wheel braking to emulate the effect of a locker differential. Gurgel has done it with its Beetle-based mini-SUVs...
4. - Suitability to alternate fuels such as ethanol and CNG: it may seem not that easy at first, but the Beetle is effectively a gasoline/ethanol flexfuel vehicle. There were some versions labelled as dedicated-ethanol in the '80s, but due to the rough idling (most noticeably in cold weather) most owners simply used gasoline instead of ethanol with no harm to the engine reliability. It was also not uncommon to hear people talking about driving a Beetle on kerosene when it was still easily available at fuel stations all across the country.
5. - Ease to modify its body without major harm to structural integrity: its chassis separated from the body allows not just repairs but also some more extensive works such as turning it into some sort of convertible or into a station-wagon, rendering the Beetle easier to upfit to different users' needs compared to modern "people's cars" with an unibody layout.